US1361587A - Reflector - Google Patents

Description

Q B. JONES.

I REFLECTOR. APPLICATION FILED JULY 13.1920.

1,361,587. Patented D. 7 19 20.

d INVENTOR.

ATTORNEYS.

' UNI-TED, STA

TES

PATENT, OFFICE.

' BASSETT JONES, OF MAHWAH, NEW JERSEY.

REFLECTOR.

Specification of Letters Patent.

Patented Dec. 7, 1920.

Application filed July 13, 1920'. Serial No. 395,893.

To all whom it may concern:

the modern high efficiency incandescent lamp. One object of my invention is to provide a small compact reflector for either direct, indirect or semi-indirect lights. that will give a higher efliciency and a betterdistribution of light than has heretofore been possible with a reflector of like size.

A second object of my invention is to provide a reflector unit of high efficiency which shall screen the light from direct vision, but which shall also distribute the light substantially uniformly over the plane.

of use independently of reflection from the ceiling. V 1

A third object of my invention is to provide a'i lighting un t in which the reflector shall be so positioned with respect to the high intensity source as to give thedesired light distribution with best efliciency.

According to my invention the reflector comprises at least three superimposed reflector elements or sections, the lower elementv being disposed directly below the source oflight and preferably consisting of a translucent reflector in the form of a hyperbola.

The lower element also has a central cusp projecting upwardly at its center immediately below the source of light. The cusp is useful in preventing the focusing of the light near the canopy. This is very important, as the desired light distribution cannot be maintained unless such focusing is prevented. The use of three superimposed reflector elements, the lower one being of hyperbolic form,'permits me to obtain the desired light distribution with a reflector of minimum horizontal diameter.

I find, ,moreover, that to obtain suitable efiiciencies when using a three element reflector of the type just described the position of the high intensity source must be fixed with respect to the reflector within narrow limits. The proper relation between the light source and the reflector is described in detail hereinbelow.

A specific embodiment of my invention is;

illustrated in the which,

The figure .is an elevational view partly in section. OI a lighting unit according to my invention. v

. Referring to the drawing, 1 is a hood within which is mounted the usual or any desired socket for receiving the lamp 2. The lamp has a filament 3- which is preferably of the high intensity type. v

The reflector comprises a glass bowl 4 imaccompanying drawing in mediately beneaththe lamp and two metallic louvers-5 and 6 above the bowl, the louvers being spaced from the bowl and from each other. The lower louver 5 is preferably substantially equal in outside diameter to the bowl and the upper louver 6 is preferably somewhat less in outside diameter than the lower one. Louvers 5 and 6 are substantially parallel and have substantially the form of inverted truncated cones. also substantially parallel to the louvers. The louvers 5 and 6 have reflecting surfaces both inside and out. i i

v The ,louver 6 is supported from hood, 1 by spring links 'such as 7. Louver 5 is fixed to louver 6 by spring links, such as 8, which also extend downwardly from the outer edge of louver 5- and are provided with hooked ends such as 9, which project under theouter-edge of the bowl 4. The reflector as a whole can thus be readily removed from the hood 1 or the bowl 4 can be disconnected from the louver 5 as desired.

It is of importance that the filament 3 of the lamp be properly positioned with respect to the reflector. For commercially necessary efliciencies and light distribution, the filament 3 must lie between the plane of the bottom of the opening in louver 6 and the plane of the opening in the bottom of the louver marked 5. It is preferable also that the filament lie above all lines which can be drawn from a circle on the inner surface of the bowl 4 about one-eighth of an inch below the edge of the bowl and just The outer portion of the bowl 4 is a plane which is slightly above the edge of v bowl 4. The vertical distance between the 1 diameter.

5 to the lower edge of the lower-louver.

The results of tests of reflector 'units made according to my invention show that it has a very high efliciency, that its light distribution is very uniform over the plane of use, and that the efficiency and light distribution given by' it are largely independent of the distance of the unit from the ceiling. The reflector unit according to my invention has, moreover, a relatively small Having thus described my invention, I claim:

1. The combination with; a light source of a reflector unit having a lower bowl and two spaced conical louvers above said bowl,

said source lying below the plane of the lower edge of the upper of said louvers and above any linegrazing the loweredge of the lower of said louvers and intercepting said bowl near its outer edge.

2. The combination with a; light source of a reflector unit having a lower bowl andtwo spaced conical louversabove said bowl, said source lying below the plane of the lower edge of the upper of said louvers and above any line grazing the lower edge ofI-the upper of said louvers and intercepting the lower of said louvers near its outer edge.

3. The combination with a light source of a reflector unit having a lower bowl and two spaced conical louvers above said bowl, said source lying below the plane of the lower edge of the upper of said louvers andabove any line grazmg the lower edgeof the lower of said louvers and intercepting said bowl near its outer edge, said source also lying above any line grazing the lower 1 edge of the upper of said louvers and intercepting the lower of said. louvers near its outer edge. I

BASSETT JONES.

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